516 



COMPOSITES. 



in a corymb-like peduncled cluster. Flowers yellow. Involucre of 

 numerous scale-like bracts. Receptacle flat or low, naked. Achenes 

 5-ribbed or 3 to 5-angular, with broad truncate summit bearing a low 

 crown-like pappus or none. 



1. T. camphoratum Less. Dune Tansy. Villous-tomentose 

 when young, the wool more or less deciduous in age; herbage with 

 the aroma of camphor; stems robust, decumbent or ascending, 1 to 2i 

 ft. long: primary and secondary divisions of the leaves much crowded, 

 the latter oval or oblong, the margin more or less revolute; achenes 

 glandular. 



Sand-dunes at San Francisco. Aug. -Nov. 



33. ARTEMISIA L. Sage Brush. 

 Herbs or shrubby plants, mostly bitter and aromatic, with alternate 

 leaves. Heads small, nodding or erect, in panicled spikes or racemes. 

 Flowers yellow or purplish, all tubular; disk-flowers perfect and mar- 

 ginal ones pistillate or all perfect. Rays none. Corolla of the pis- 

 tillate flowers 2 or 3-toothed, of the perfect flowers 5-toothed. Involu- 

 cre imbricated, dry and scarious. Receptacle nearly flat, naked. 

 Achenes obovoid or oblong, glabrous, with a small terminal areola. 

 Pappus none. (Named for Artemisia, wife of Mausolus, king of 

 Caria.) 



Shrub; herbage grayish-puberulent; leaves linear-filiform and entire or 

 with linear filiform divisions; involucre hemispherical 



3. A. Calif ornica. 



Herbaceous or somewhat woody at base. 

 Involucre oblong; leaves green above, commonly white-tomentose 



beneath, broad, often pinnatifid ... 1. A. heterophylla. 



Involucre hemispherical. 

 Herbage green, glabrous; leaves bipinnately divided, the divisions 



serrulate or incised 2. A. biennis. 



Herbage green and nearly glabrous; leaves linear, entire 



4. A. dracunculoides. 



Herbage densely silky-villous all over; leaves once to twice pinnately 

 divided into linear entire segments 5. A. pycnocephala. ' 



1. A. heterophylla Nutt. California Mugwort. Stems 

 erect, wood} T at base, strict, 3 to 6 ft. high; leaves lanceolate to 

 oblong, ovate or elliptic, sparingly pinnatifid (with downward inci- 

 sions), cleft or often entire (especially the upper), green above, white- 

 tomentose beneath, sometimes glabrous; heads mostly erect, in dense 

 spikes in an open or more commonly dense terminal panicle, the 

 main axis leafy; involucre oblong, glabrous; marginal flowers pistil- 

 late, disk-flowers perfect, all fertile, as also in the next two species. 



Common along stream-banks and elsewhere throughout California. 

 Leaves usually large, often 6 in. long and 2\ in. broad, exceedingly 

 polymorphic as to the margin. Treated (and perhaps more wisely) 

 as A. vulgaris L. var. Californica Bess, in the Botany of California. 



2. A. biennis Willd. Glabrous inodorous tasteless biennial, 

 erect, virgate, 1£ to 3 ft. high; leaves bipinnately divided into lan- 

 ceolate or broadly linear incised or serrulate divisions, or the upper- 

 most only pinnatifid; heads crowded on the short branchlets, the 



